Surface finishing for screws, nuts, bolts & fasteners
Functional and visual finishing – from corrosion protection and friction-coefficient adjustment through to technical cleanliness. Tailor-made for your application.
For projects with specific requirements for fasteners, GEVAG is the right partner. We optimize screws, bolts, nuts and washers through targeted functional or visual adjustment of the surface – for standard parts to DIN/ISO as well as for individual drawing and special parts. The goal: the best possible functionality and quality for exactly your application area.
Our processes at a glance
From metallic finishing to ultra-fine cleaning – choose the process that fits your requirement.
Surfaces that do more
Whether corrosion protection, defined friction coefficients or technical cleanliness – we finish your fasteners exactly to requirement.
Metallic finishes
To improve corrosion protection and appearance, we enhance fasteners with metallic surfaces made of zinc, zinc-nickel, copper, brass or tin – depending on the intended use and requirement. Together with you, we find the ideal combination of protective effect, appearance and cost-efficiency.
Coatings & sealings
Beyond metallic platings, we offer sealings, anti-friction coatings as well as adhesive and sealing coatings and cathodic dip coatings (CDC). This allows friction coefficients to be precisely adjusted, prevailing torques to be secured, or additional sealing and adhesive functions to be realized directly on the fastener.
Fine cleaning
For sensitive fastening components, we offer industrial fine cleaning. On state-of-the-art equipment, parts are degreased, de-oiled, fine-cleaned and ultra-fine-cleaned – in accordance with common standards such as VDA 19.1 and ISO 16232. This gives you defined cleanliness levels for all downstream assembly and application processes, exactly to the required specification.
Functional finishing – precisely adjusting friction and corrosion protection
For the final tuning of friction coefficient and protective effect, we rely on proven post-treatments. Learn more about the individual processes:
Oiling
Defined oil films ensure constant friction coefficients during assembly and protect the parts temporarily against corrosion – ideal for transport, storage and process-reliable bolting.
Waxing
Wax coatings improve the sliding properties and ease of assembly, reduce the tightening torque and at the same time provide light corrosion protection.
Passivation
Passivation creates a protective conversion layer and increases corrosion protection – especially for demanding fields of application in automotive and medical technology.
How your inquiry works
1
Inquiry & contact
You describe your requirement to us: the component, the desired surface properties and the area of use. A call, a drawing or a sample is all it takes to get started.
2
Technical consultation
Our experts analyze the requirement and recommend the right process – from metallic finishing and coatings through to oiling, waxing or passivation.
3
Solution & quote
You receive a tailored process recommendation including specification, standards reference and a transparent quote.
4
Implementation & quality assurance
We carry out the surface treatment and ensure quality in accordance with applicable standards (including VDA 19.1 and ISO 16232).
5
Delivery & support
You receive your optimized fasteners on schedule – on request including parts management and logistics.
Sectors and applications
Request a non-binding consultation
Contact us! Our experts look forward to assisting you.
Why GEVAG?
Since 1879, GEVAG has been dedicated to the development and manufacturing of fastening elements. Our products range from screws, bolts, nuts, set screws, and washers to securing elements, stamped and bent parts, and turned and milled parts. We supply custom-made products and standard parts according to DIN and ISO. We meet requirements in thermoplastics, steel, as well as light and non-ferrous metals with our KUNST and TAP brands. GEVAG is your powerful single-source partner.